﻿PLATE 
  LXI. 
  — 
  To 
  face 
  page 
  154. 
  

  

  Salina 
  1 
  

  

  shales. 
  ^ 
  

  

  Niagara 
  ■> 
  

   limestone. 
  I 
  

  

  Clinton 
  

   shales. 
  

  

  N. 
  H. 
  Darton, 
  photo. 
  

  

  UPPER 
  Silurian 
  Rocks 
  in 
  Road 
  Cut 
  Near 
  Howe's 
  Cave. 
  Schoharie 
  Co. 
  

  

  